| 丁香菌酯在水中的光解影响因素研究 |
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| 引用本文： | 周雨杭,于晓龙,曹战文,郭南,侯新港,逯忠斌,侯志广.丁香菌酯在水中的光解影响因素研究[J].农药学学报,2022,24(4):890-894. |
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| 作者姓名： | 周雨杭 于晓龙 曹战文 郭南 侯新港 逯忠斌 侯志广 |
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| 作者单位： | 1.吉林农业大学 植物保护学院，长春 130118 |
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| 基金项目： | 农业农村部东北植物营养与农业环境重点实验室开放基金课题(KLAE201802-02)；农业部行业标准制定嘧菌环胺在人参中的残留限量标准项目(14202008) |
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| 摘 要： | 为了更好地了解丁香菌酯(coumoxystrobin)在环境中的归趋，基于《化学农药环境安全评价试验准则》推荐方法，采用高效液相色谱 (HPLC) 分析方法研究了光源(500 W氙灯和20 W汞灯)、初始质量浓度 (1、5、10和15 mg/L)、pH值(4、7和9)和添加助溶剂吐温80对丁香菌酯在水中光解的影响。结果表明:在试验条件下，丁香菌酯的光解反应均符合准一级反应动力学方程；在500 W氙灯和20 W汞灯两种光源条件下，其半衰期分别为2.23和1.10 h，20 W汞灯下的光解速率约为500 W氙灯下的2倍；在同一光源下，光解速率随丁香菌酯初始质量浓度的增加而降低，二者呈负相关关系；丁香菌酯在pH值不同的3种缓冲溶液中的光解速率从大到小依次为pH 9、pH 4和pH 7；吐温80对丁香菌酯的光解有抑制作用。该研究结果可为丁香菌酯的合理使用及环境评价提供参考。
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| 关 键 词： | 丁香菌酯 高效液相色谱 水环境 光化学降解 光解速率 |
| 收稿时间： | 2021-11-25 |
Study on influencing factors of photochemical degradation of coumoxystrobin in buffer solutions |
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| Institution: | 1.College of Plant Protection, Jilin Agricultural University, Changchun 130118, China |
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| Abstract: | In order to better comprehend the fate of coumoxystrobin in the environment, the photolysis of coumoxystrobin under different light sources (500 W xenon lamp and 20 W mercury lamp), initial concentrations (1, 5, 10, and 15 mg/L) and pH values (4, 7 and 9) were investigated based on the method recommended by China Test Guidelines on Chemical Pesticide Environmental Safety Assessment via high-performance liquid chromatography. The results demonstrated that the photolysis of coumoxystrobin under the experimental conditions matched quasi first-order kinetic equation. The photolysis half-lives under 500 W xenon lamp and 20 W mercury lamp were 2.23 and 1.10 h, respectively. The photolysis rate of 20 W mercury lamp was about twice that of 500 W xenon lamp. Under the same irradiation conditions, the photolysis rate decreased with the increasing initial concentrations, which were negatively correlated. The photolysis rate of coumoxystrobin in the three buffer solutions showed as follows: pH 9 > pH 4 > pH 7. Tween 80 could inhibit the photolysis of coumoxystrobin. The study provide references for the rational use and environmental assessment of coumoxystrobin. |
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